I am not from Brazil, nor am I closely following its politics, but I would like to pose a genuine question: in a modern liberal democracy, doesn’t a four-term presidency represent too much power concentrated in one person?
Yes.
He just got voted in, if he's doing a good job or people don't like the other guy, people will keep voting or him
no. as presidency is not a dictatorship
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It's not four consecutive terms, you are only allowed 2 consecutive terms.